In part 3 of the material handling PLC program I'm going to test the program in the online mode and then continue writing the program based on what I want the PLC program to do for me.
The first problem that this PLC program has is that when the full blue box is transferred to another section of the factory and the next blue box arrives in front of sensor 2, there is no code in the PLC program for stopping motor 2.
The other problem is that when the operator is going to run the machine by pressing the start switch, motor 1 is not going to turn on.
Let's see how we can fix these problems.
In the previous lesson I added the address of the start switch in the reset input of the signal lamp flip-flop and now I'm able to run motor 1 by pressing the start switch but the problem is that as soon as I take my hand off the switch the motor is going to stop again!
The other problem that t...
As I said previously, I also have a reset switch for this machine. In this lesson, I'm going to add an open contact to the reset input of the counter so that when the reset switch is pressed the accumulated value for the counter is going to be reset to zero.
At the end, when the PLC program is c...
In this lesson, I'm going to write a PLC program for a vehicle barrier at the parking entrance using a count up and down instruction and also two comparator instructions. What I need the vehicle barrier to do for me is, when the number of vehicles within the parking lot is equal to 500, it should...
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